How to measure the running time of a thread?

Question

C++ / C#

How to measure the running time of threads in a recursive function?
for example there is a function (sample code)

void function(int i, int j )
{
#pragma omp task
if (i>j) 
    function(i,  j );
#pragma omp task
if (i<j)
  function(j, i );
#pragma omp taskwait
}

//сама функция вызывается 
#pragma omp parallel 
  {
#pragma omp single nowait
    {
      function(i, j );
    }
  }

how to find out the running time of each thread?